@Christopher2222 

 im running laptop windows 7 / 64 bit , Maple 15 /64 bit , 3gb of ram.

might be a problem in visual libraries , i have same problem in maple 14

when i open maple i can type letters but when i start to type some operational command for example + or - or multiply everything i typed goes away and i cant see characters from the start

http://imageshack.us/photo/my-images/338/problemga.jpg/